Break away fastening system
a fastening system and breakaway technology, applied in the direction of load-modified fasteners, screw heads, soldering devices, etc., can solve the problems of plastic deformation of the coupling interface, significantly weakening the strength of the weld stud laminate interface, and the use of blow-fed weld guns, so as to improve the effect of improving the distribution of torsional stud loads into the sheet metal
Inactive Publication Date: 2005-06-09
NEWFREY
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Benefits of technology
The patent text describes a weld stud assembly for use with a drawn arc welding system that improves the strength and durability of welded joints. The assembly includes a head with an annular weldment area that matches the shape of the typical circular weldment area, while also improving the distribution of torsional stud loads. This design ensures that the welded joints are stronger than the individual components, reducing the likelihood of failure under high torque or tension wrenches. Overall, the weld stud assembly provides a closed process chain that prevents damage to the structural part and reduces the need for reworking costs.
Problems solved by technology
The size, weight, and configuration of these studs prevent their use in blow fed weld guns.
The weldment provides a stress riser which significantly weakens the strength of weld stud laminate interface.
Repeated loading of the weld stud leads to plastic deformation in the coupling interface and premature failure of the stud to laminate interface.
It is hard to establish what the reason for the failure was.
In addition, reworking of the fractured sheet metal of a car body requires a considerably greater expenditure than reworking in the case of a fractured stud.
Method used
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[0033] The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
[0034]FIG. 1 represents the drawn arc weld stud 10 according to the teachings of the present invention. The weld stud 10 is formed of three major components; a shank 12, a head 14, and an annular weldment portion 16. By way of non-limiting example, the shank 12 can be a M6 threaded fastener. Equally, the shank can take the form of pine-tree connector or other sized threaded fastener.
[0035] The head 14 portion is formed using cold heading methodologies. The head 14 for a M6 fastener has an exterior diameter of about 13 mm and a thickness of about 2 mm. The head further has a flat lower surface 15 having a diameter of about 13 mm. The strength of the fastener is a function of the thickness of the head. As such, as the thickness of the head is increased, generally the strength of the weld stud 10 is increased. Increas...
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Abstract
A fastening system is providing, the fastening system has a weld stud having an annular weldment portion and a fracturable nut. The fracturable nut and stud construction is configured to fail under torsional load prior to the structural parts failure.
Description
[0001] This application is a continuation of U.S. patent application Ser. 10 / 714,500 filed on Nov. 14, 2003, which is a continuation application of PCT International Application PCT / US03 / 20836 filed on Jul. 3, 2003, which claims the benefit of U.S. Provisional Application No. 60 / 416,614 filed on Oct. 7, 2002 and U.S. Provisional Application No. 60 / 420,951, filed on Oct. 24, 2002. The disclosures of the above applications are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to a fastening system for fastening a member to a structural metal part and, more particularly, for fastening a member to sheet metal. A threaded metal stud having an annular welding surface is fastened to the structural part in short-time arc welding, and a fracturable lock nut is screwed onto the stud to fasten the member to the structural part. BACKGROUND OF THE INVENTION [0003] Metallic weld stud are typically solid, non-compressible bodies which are formed by standa...
Claims
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IPC IPC(8): B23K9/20B23K35/02F16BF16B1/00F16B31/02F16B35/04F16B37/06F16B39/10
CPCB23K9/207B23K35/0288Y10T403/478F16B37/061F16B31/021F16B31/02F16B35/04
Inventor RAMASAMY, SIVAKUMAR
Owner NEWFREY